'Microsoft.Subscription/aliases@2021-10-01' - No . allowed in name

[BramVandendaele]

Bicep version
Bicep CLI v0.27.1

Describe the bug
When trying to create a subscription alias. When using a . in the name. I receive an error that the resource cannot be found. When replacing the '.' with a '-'. Then it works.

To Reproduce
When deploying the module like below:
param subscriptionName string = 'test.subscription.name'

resource subscription 'Microsoft.Subscription/aliases@2021-10-01' = {
  name: subscriptionName
  scope: tenant()
  properties: {
    billingScope: billingAccount
    displayName: subscriptionName
    workload: 'Production'
    additionalProperties: {
     managementGroupId: managementGroupId
   }
  }

error received below:

{"code":"DeploymentFailed","target":"/providers/Microsoft.Management/managementGroups/xxxxxxx/providers/Microsoft.Resources/deployments/xxxxxx","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"BadRequest","message":"The resource you are looking for has been removed, had its name changed, or is temporarily unavailable."}]}

When using
param subscriptionName string = 'test-subscription-name'

there is no error anymore.

Additional context
Add any other context about the problem here.

[slavizh]

This is nor bicep bug not a bug on the resource provider. If I am not mistaken quite majority of resource providers does not allow using . in the name of the resource.

[slavizh]

Note that alias name and displayName are two different properties. They do not have to be the same. The alias name is the name of the alias resource. displayName will be the name of the subscription. The display name of the subscription most likely allows using . as that is display name, not resource name.